1. Department of Chemistry, Faculty of Science, South Valley University, Qena, Egypt
2. Department of Natural Products Biology, GBF‐Gesellschaft für Biotechnologische Forschung mbH, Mascheroder Weg 1, 38124 Braunschweig, Germany
3. Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Pharmaceutical industries, Sinai University, El‐Arish, Egypt